Radio influence voltage is high frequency
voltage that appears at the terminals of
high voltage electrical equipment. It is
used along with partial discharge as a
measure of the dielectric properties of
insulation and to determine if there is the
potential for leakage current in your test
sample that could lead to future damage.

The DDX9121-RIV is partial discharge testing
equipment that offers single or multi-phase
partial discharge and RIV testing of all
transformers, rotating machines, switchgear,
surge arrestors.